EEVISION OF ELEODITNI BLAISDELL. 337 



Specimens from the P^arallone Islands have been determined as 

 consohrina by Doctor Horn, but I prefer to consider them as a form 

 of parvicollis, for the following reasons : 



The general facies is more like the latter species, although in some 

 specimens the marginal bead is entire, the specimens are decidedly 

 less convex, and the pronotal disc is feebly impressed laterally, the 

 basal constriction is stronger, and the sculpturing is plainly more 

 muricate laterally than tuberculate. Again, parnlcoUis is much more 

 abundant along the coast on the mainland at points opposite the 

 islands than is consobnva, so that in all probability when that body 

 of land became separated from the mainland it was populated with 

 the form of j)arricoUis existing at that time, and as this change 

 occurred in comparatively recent times, the species has undergone but 

 slight change since and is practically identical with that which is 

 now found along the coast on the mainland. 



I have collected for several years about San Francisco Bay and 

 have not taken a single specimen of consohrina^ while I have found 

 parvicollis abundant. Consohrlna is surely more abundant south 

 than north of San Francisco. 



In coHsohrina the geuse are not produced as in hJanrhardii, and for 

 remarks on scahi^pennis see p. 338. In fuchsii the prothorax is com- 

 paratively smaller and less convex. 



In some specimens (females from Los Angeles County) the elytra 

 are densely and distinctly tuberculate throughout. 



General observations. — The mentum is triangulo-parabolic to para- 

 bolic in outline; surface convex at middle and more or less foveate 

 •along the sides, rather densely but not distinctly punctate and not 

 noticeably setose. 



The prosternum is not strongly prominent ventrally with the 

 coxae, coarsely sculptured, usually distinctly grooved along the mid- 

 dle, horizontal; rarely feebly arcuate antero-posteriorly between the 

 coxa^, strongly and horizontally mucronate behind; often vertically 

 truncate posteriorly with the angle more or less well developed as a 

 mucro, which may be deflexed or oblique. 



The mesosternum is arcuately and obliquely declivous, deeply and 

 rather broadly concave, so that it appears somewhat bilobed. 



The metasternum laterally between the coxse is as long as the width 

 of a mesotibia at middle or base. 



The abdominal process is subquadrate (male) to moderately trans- 

 verse (female) and a third (male) to a sixth (female) wider than 

 the metasternal salient. 



In the male the post-coxal part of the first abdominal segment is 

 equal in length to the process, and also to that of the second ; the 

 latter is twice as long as the fourth ; the third is a half longer than 

 the fourth. 



59780— Bull. 63—09 22 



